Answer:
28
Explanation:
Multiply by the reciprocal of , that is , then
× 24 = 7 × 4 = 28 ← biscuits he had to start with
John ate 6/7 of total biscuits, let the total number of biscuits is 'x'
(6/7)(x) = 24
6x = 24*7
6x = 168
x = 28
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, that is 
, then × 24 = 7 × 4 = 28 ← biscuits he had to start with